Vulnerability-Lookup

CVE-2026-34621 (GCVE-0-2026-34621)

Vulnerability from cvelistv5 – Published: 2026-04-11 06:45 – Updated: 2026-08-27 22:15

CISA Previdian

Title

Acrobat Reader | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

Summary

Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Severity

8.6 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-11 00:00 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)

Assigner

adobe mitre root

References

2 references

URL	Tags
https://helpx.adobe.com/security/products/acrobat…	vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

3 products

Vendor	Product	Version	CPE status
Adobe	Acrobat DC	Affected: 0 , ≤ 26.001.21367 (custom) Unaffected: 26.001.21411 (custom)	guessed
Adobe	Acrobat Reader DC	Affected: 0 , ≤ 26.001.21367 (custom) Unaffected: 26.001.21411 (custom)	guessed
Adobe	Acrobat 2024	Affected: 0 , ≤ 24.001.30356 (custom) Unaffected: 24.001.30362 (Win), 24.001.30360 (Mac) (custom)	guessed

Date Public

2026-04-10 17:00

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: e4a2e559-ec5f-408e-9270-b354f1ec28c5

Vulnerability ID: CVE-2026-34621

Status: Confirmed

Status Updated: 2026-04-13 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2026-04-13

Asserted: 2026-04-13

Scope

Notes: KEV entry: Adobe Acrobat and Reader Prototype Pollution Vulnerability | Affected: Adobe / Acrobat and Reader | Description: Adobe Acrobat and Reader contain a prototype pollution vulnerability that allows for arbitrary code execution. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-04-27 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://helpx.adobe.com/security/products/acrobat/apsb26-43.html ; https://nvd.nist.gov/vuln/detail/CVE-2026-34621

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details

Cwes	CWE-1321
Feed	CISA Known Exploited Vulnerabilities Catalog
Product	Acrobat and Reader
Due Date	2026-04-27
Date Added	2026-04-13
Vendorproject	Adobe
Vulnerabilityname	Adobe Acrobat and Reader Prototype Pollution Vulnerability
Knownransomwarecampaignuse	Unknown

References

CVE-2026-34621

Created: 2026-04-13 18:00 UTC | Updated: 2026-04-13 18:00 UTC

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 03769f18-4f8a-493d-940a-57df335eaa67

Vulnerability ID: CVE-2026-34621

Status: Confirmed

Status Updated: 2026-06-01 13:07 UTC

Exploited: Yes

Timestamps

First Seen: 2026-06-01

Asserted: 2026-06-01

Scope

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	Acrobat Reader \| Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (CWE-1321)
Vendor	Adobe
Product	Acrobat Reader
Added Date	2026-06-01T13:07:13.584Z
Cvss Score	8.6
Epss Score	0.07086
Cvss Severity	HIGH
Epss Percentile	0.93405
Used In Malware	unknown
Ahead Of Cisa Kev	`{ "count": 1, "unit": "day" }`
Not Yet In Cisa Kev	False

References

Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC

Show details on NVD website

JSON

To clipboard

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CERTFR-2026-AVI-0429

Vulnerability from certfr_avis - Published: 2026-04-13 - Updated: 2026-04-13

Une vulnérabilité a été découverte dans Adobe Acrobat. Elle permet à un attaquant de provoquer une exécution de code arbitraire.

Adobe indique que la vulnérabilité CVE-2026-34621 est activement exploitée.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Adobe	Acrobat	Acrobat 2024 versions antérieures à 24.001.30360 sur macOS
Adobe	Acrobat Reader	Acrobat Reader DC versions antérieures à 26.001.21411 sur Windows et macOS
Adobe	Acrobat	Acrobat DC versions antérieures à 26.001.21411 sur Windows et macOS
Adobe	Acrobat	Acrobat 2024 versions antérieures à 24.001.30362 sur Windows

References

Title

Publication Time

FKIE_CVE-2026-34621

Vulnerability from fkie_nvd - Published: 2026-04-11 07:16 - Updated: 2026-08-28 00:17

CISA Previdian

Severity

8.6 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	psirt@adobe.com	https://helpx.adobe.com/security/products/acrobat/apsb26-43.html	Vendor Advisory
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621	US Government Resource

Impacted products

Vendor	Product	Version
adobe	acrobat_dc	*
adobe	acrobat_reader_dc	*
apple	macos	-
microsoft	windows	-
adobe	acrobat	*
microsoft	windows	-
adobe	acrobat	*
apple	macos	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Acrobat DC",
          "vendor": "Adobe",
          "versions": [
            {
              "lessThanOrEqual": "26.001.21367",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "26.001.21411",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Acrobat Reader DC",
          "vendor": "Adobe",
          "versions": [
            {
              "lessThanOrEqual": "26.001.21367",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "26.001.21411",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Acrobat 2024",
          "vendor": "Adobe",
          "versions": [
            {
              "lessThanOrEqual": "24.001.30356",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "24.001.30362 (Win), 24.001.30360 (Mac)",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "psirt@adobe.com"
    }
  ],
  "cisaActionDue": "2026-04-27",
  "cisaExploitAdd": "2026-04-13",
  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "Adobe Acrobat and Reader Prototype Pollution Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*",
              "matchCriteriaId": "C1D9FFF0-C948-4C17-8E0C-9245DD3ADDCB",
              "versionEndExcluding": "26.001.21411",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*",
              "matchCriteriaId": "6E91BACA-4DE1-4412-BE17-0992FDEEC66B",
              "versionEndExcluding": "26.001.21411",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E",
              "vulnerable": false
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*",
              "matchCriteriaId": "0287242D-1301-49AF-B416-C37114304EF4",
              "versionEndExcluding": "24.001.30362",
              "versionStartIncluding": "24.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*",
              "matchCriteriaId": "528A400D-E038-41E4-B3C8-ED5BA10BD63E",
              "versionEndExcluding": "24.001.30360",
              "versionStartIncluding": "24.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027) vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file."
    }
  ],
  "id": "CVE-2026-34621",
  "lastModified": "2026-08-28T00:17:16.097",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 6.0,
        "source": "psirt@adobe.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-34621",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-11T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-11T07:16:03.633",
  "references": [
    {
      "source": "psirt@adobe.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://helpx.adobe.com/security/products/acrobat/apsb26-43.html"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621"
    }
  ],
  "sourceIdentifier": "psirt@adobe.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ],
      "source": "psirt@adobe.com",
      "type": "Secondary"
    }
  ]
}

GHSA-VCQH-932G-M3QJ

Vulnerability from github – Published: 2026-04-11 09:30 – Updated: 2026-04-13 18:30

Details

Severity

9.6 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-34621"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-11T07:16:03Z",
    "severity": "CRITICAL"
  },
  "details": "Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier are affected by an Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027) vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.",
  "id": "GHSA-vcqh-932g-m3qj",
  "modified": "2026-04-13T18:30:38Z",
  "published": "2026-04-11T09:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34621"
    },
    {
      "type": "WEB",
      "url": "https://helpx.adobe.com/security/products/acrobat/apsb26-43.html"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34621"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

NCSC-2026-0111

Vulnerability from csaf_ncscnl - Published: 2026-04-12 08:42 - Updated: 2026-04-13 09:38

Summary

Kwetsbaarheid verholpen in Adobe Acrobat

Scope

1 vulnerability in this advisory, including CVE-2026-34621.

CVE-2026-34621

Acrobat Reader versions 24.001.30356, 26.001.21367, and earlier contain a Prototype Pollution vulnerability that may allow arbitrary code execution when a user opens a malicious file.

9.6 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Known affected: 4 products

Open the full advisory

WID-SEC-W-2026-1047

Vulnerability from csaf_certbund - Published: 2026-04-09 22:00 - Updated: 2026-05-12 22:00

Summary

Adobe Acrobat Reader: Schwachstelle ermöglicht Offenlegung von Informationen und Codeausführung

Severity

Hoch

Scope

1 vulnerability in this advisory, including CVE-2026-34621.

CVE-2026-34621

Known affected: 4 products Last affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-34621 (GCVE-0-2026-34621)

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Vendor Report Successful Exploitation Confidence: 80% Source: cisa-kev

Details

References

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

CERTFR-2026-AVI-0429

Solutions

FKIE_CVE-2026-34621

GHSA-VCQH-932G-M3QJ

NCSC-2026-0111

WID-SEC-W-2026-1047

Tags

Sightings

Nomenclature

Related by attack behaviour