CVE-2026-95665 (GCVE-0-2026-95665)

Vulnerability from cvelistv5 – Published: 2026-09-22 13:01 – Updated: 2026-09-22 15:33
VLAI
Title
MISP Reflected Cross-Site Scripting in Event Export Confirmation Form via Unescaped JSON
Summary
MISP contains a reflected cross-site scripting (XSS) vulnerability in the event REST search export confirmation form. The view template app/View/Events/ajax/eventRestSearchExportConfirmationForm.ctp renders a URL-supplied event ID list into a single-quoted JavaScript string literal using PHP's json_encode() without any hex-encoding flags. By default, json_encode() escapes double quotes and backslashes but does not escape single quotes. Because the JavaScript string is delimited by single quotes, an attacker can inject a single-quote character to terminate the string literal and execute arbitrary JavaScript in the victim's browser session. The vulnerability affects the Default and UiBeta themes, both of which render this view. The Overmind theme's own copy of the form already passed the value through an escaped data attribute and was not affected by this specific sink. Preconditions: the victim must be an authenticated MISP user and must actively open or navigate to the attacker-crafted URL. The attacker does not require an account or any prior access to the MISP instance. Security impact: successful exploitation allows execution of arbitrary JavaScript in the context of the MISP web application, potentially leading to session hijacking, unauthorized actions performed on behalf of the victim, exfiltration of sensitive data visible in the session, or further client-side attacks. The vulnerable component's own confidentiality, integrity, and availability are not directly compromised; the impact is on the underlying user session.
Severity
5.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 15:32 UTC
CWE
  • CWE-79 - Improper Neutralization of Input in Web Page ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version CPE status
MISP MISP Affected: 0 , < 2.5.47 (semver)
guessed Create a notification for this product.
Credits
Niels Teusink of Eye Security iglocska Claude Opus 5 (1M context)
GCVE extensions
AI involvement GCVE-BCP-05-X-01
Whole record AI-generated Human-reviewed GNA-1

Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.

ai-computer-assisted:llm-generatedai-computer-assisted:classification
Model Source Identifier
qwen3.8:27b ollama qwen3.8:27b
Patch provenance GCVE-BCP-05-X-02
Generator
patch2vuln.py on 2026-09-22 12:57
Model
qwen3.8:27b
Input
https://github.com/MISP/MISP/commit/ad4ff238d.patch b2c68a624115…
Confidence
high
Commit Subject Patch SHA-256
ad4ff238df97 fix: [security] Escape the event id list in the export b2c68a624115…
Fix summary

The vulnerability is remediated by adding the JSON_HEX_TAG, JSON_HEX_APOS, JSON_HEX_QUOT, and JSON_HEX_AMP flags to the json_encode() call at the rendering sink. These flags cause angle brackets, single quotes, double quotes, and ampersands to be hex-encoded (e.g., ' becomes \u0027), preventing any of these characters from breaking out of the single-quoted JavaScript string literal and thereby eliminating the script injection vector.

Patch summary

A single-line change in app/View/Events/ajax/eventRestSearchExportConfirmationForm.ctp: the json_encode($idList) call is replaced with json_encode($idList, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP), ensuring that single quotes, double quotes, angle brackets, and ampersands in the event ID list are hex-escaped before being interpolated into the single-quoted JavaScript string literal in the redirectToExportResult() function.

CVSS rationale

AV:N: the exploit is delivered over the network via a crafted URL. AC:L: the attack requires only crafting a URL with a single quote in the event ID list; no race conditions or special conditions are needed. AT:N: no additional attack complexity beyond what AC captures. PR:N: the attacker does not need any MISP account or privileges; the victim must be authenticated, but PR measures attacker privileges. UI:A: the victim must actively open or click the crafted link. VC/VI/VA:N: the MISP server's own confidentiality, integrity, and availability are not directly impacted. SC:L: the attacker can read session data, cookies, or other sensitive information in the victim's browser context. SI:L: the attacker can perform actions on behalf of the victim (e.g., submit forms, modify data via the API). SA:N: no impact on the availability of the underlying system.

Weakness rationale
  • CWE-79 The root cause is the failure to neutralize a single-quote character in user-controlled input (the URL-supplied event ID list) before embedding it in a single-quoted JavaScript string context. json_encode() without hex flags does not escape single quotes, allowing script injection. This is a textbook reflected XSS (CWE-79).
Attack pattern rationale
  • CAPEC-1 The attack pattern involves injecting a script fragment (a single quote followed by arbitrary JavaScript) into a web page via a URL parameter, which is then reflected into the page's JavaScript context without proper encoding. This matches CAPEC-1 (Cross Site Scripting) directly. The injection is reflected (not stored) and occurs in a script context rather than an HTML context, but CAPEC-1 is the closest and most general applicable pattern. No more specific CAPEC for script-context reflected XSS exists in the CAPEC catalog, so CAPEC-1 is the best available match.
Assumptions to verify
  • The tag_version_boundary metadata indicates the fix commit is 44 commits after tag v2.5.47, suggesting versions up to and including 2.5.47 may be affected, but no explicit affected or fixed version range is stated in the patch or commit message. The version boundary is inferred from repository metadata and may not be precise.
  • The CVSS v4.0 AT (Attack Complexity) metric value 'N' is used as the neutral/none value; the exact valid value set for AT in CVSS v4.0 is not fully confirmed from the patch evidence alone.
  • The CAPEC-1 mapping is the closest general XSS pattern available; no CAPEC specifically covers script-context reflected XSS via unescaped JSON in a single-quoted JS string, so CAPEC-1 is the best available match.
  • The Overmind theme is assumed unaffected because the commit message states it already passed the value through an escaped data attribute; this is based solely on the commit message and was not independently verified.
  • PR:N is assigned because the attacker does not require authentication to craft the malicious URL; the requirement that the victim be logged in is captured in UI:A rather than PR.
Model comparison

Selected qwen3.8:27b by deterministic-consensus-v1
The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.

Model Score Agreement Confidence Assumptions
qwen3.8:27b 6 9 high 5
Show details on NVD website
To clipboard 

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                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-95665",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-22T15:32:57.787316Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-09-22T14:17:21.180",
        "references": [
          {
            "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
            "url": "https://github.com/MISP/MISP/commit/ad4ff238d"
          }
        ],
        "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-79"
              }
            ],
            "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.