NCSC-2026-0058
Vulnerability from csaf_ncscnl - Published: 2026-02-10 19:11 - Updated: 2026-02-10 19:11Summary
Kwetsbaarheden verholpen in Microsoft Office
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:
NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.
NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.
This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten
Microsoft heeft kwetsbaarheden verholpen in Office componenten.
Interpretaties
Een kwaadwillende kan de kwetsbaarheden misbruiken om beveiligingsmaatregelen te omzeilen, zoch voor te doen als andere gebruiker en zich zo verhoogde rechten toe te kennen en toegang te krijgen tot gevoelige gegevens.
Voor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden en malafide bestand te openen of link te volgen.
Van de kwetsbaarheid met kenmerk CVE-2026-21511 meldt Microsoft informatie te hebben dat deze besproken wordt op fora. De kwetsbaarheid stelt een kwaadwillende in staat om middels een malafide bericht een NTLM-authenticatie te initiëren naar een server onder controle van de kwaadwillende, waarmee de kwaadwillende authenticatiegegevens kan bemachtigen. Er is (nog) geen publieke Proof-of-Concept-code beschikbaar en misbruik vereist een speciaal ingerichte server. Grootschalig misbruik is hiermee niet waarschijnlijk.
```
Microsoft Office Word:
|----------------|------|-------------------------------------|
| CVE-ID | CVSS | Impact |
|----------------|------|-------------------------------------|
| CVE-2026-21514 | 7.80 | Omzeilen van beveiligingsmaatregel |
|----------------|------|-------------------------------------|
Microsoft Office Excel:
|----------------|------|-------------------------------------|
| CVE-ID | CVSS | Impact |
|----------------|------|-------------------------------------|
| CVE-2026-21259 | 7.30 | Verkrijgen van verhoogde rechten |
| CVE-2026-21258 | 5.50 | Toegang tot gevoelige gegevens |
| CVE-2026-21261 | 5.50 | Toegang tot gevoelige gegevens |
|----------------|------|-------------------------------------|
Microsoft Office Outlook:
|----------------|------|-------------------------------------|
| CVE-ID | CVSS | Impact |
|----------------|------|-------------------------------------|
| CVE-2026-21260 | 7.50 | Voordoen als andere gebruiker |
| CVE-2026-21511 | 7.50 | Voordoen als andere gebruiker |
|----------------|------|-------------------------------------|
```
Oplossingen
Microsoft heeft updates beschikbaar gesteld waarmee de beschreven kwetsbaarheden worden verholpen. We raden u aan om deze updates te installeren. Meer informatie over de kwetsbaarheden, de installatie van de updates en eventuele work-arounds vindt u op:
https://portal.msrc.microsoft.com/en-us/security-guidance
Kans
medium
Schade
high
CWE-20
Improper Input Validation
CWE-122
Heap-based Buffer Overflow
CWE-125
Out-of-bounds Read
CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CWE-502
Deserialization of Untrusted Data
CWE-807
Reliance on Untrusted Inputs in a Security Decision
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"text": "Microsoft heeft kwetsbaarheden verholpen in Office componenten.",
"title": "Feiten"
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{
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"text": "Een kwaadwillende kan de kwetsbaarheden misbruiken om beveiligingsmaatregelen te omzeilen, zoch voor te doen als andere gebruiker en zich zo verhoogde rechten toe te kennen en toegang te krijgen tot gevoelige gegevens.\n\nVoor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden en malafide bestand te openen of link te volgen.\n\nVan de kwetsbaarheid met kenmerk CVE-2026-21511 meldt Microsoft informatie te hebben dat deze besproken wordt op fora. De kwetsbaarheid stelt een kwaadwillende in staat om middels een malafide bericht een NTLM-authenticatie te initi\u00ebren naar een server onder controle van de kwaadwillende, waarmee de kwaadwillende authenticatiegegevens kan bemachtigen. Er is (nog) geen publieke Proof-of-Concept-code beschikbaar en misbruik vereist een speciaal ingerichte server. Grootschalig misbruik is hiermee niet waarschijnlijk.\n\n```\nMicrosoft Office Word: \n|----------------|------|-------------------------------------|\n| CVE-ID | CVSS | Impact |\n|----------------|------|-------------------------------------|\n| CVE-2026-21514 | 7.80 | Omzeilen van beveiligingsmaatregel | \n|----------------|------|-------------------------------------|\n\nMicrosoft Office Excel: \n|----------------|------|-------------------------------------|\n| CVE-ID | CVSS | Impact |\n|----------------|------|-------------------------------------|\n| CVE-2026-21259 | 7.30 | Verkrijgen van verhoogde rechten | \n| CVE-2026-21258 | 5.50 | Toegang tot gevoelige gegevens | \n| CVE-2026-21261 | 5.50 | Toegang tot gevoelige gegevens | \n|----------------|------|-------------------------------------|\n\nMicrosoft Office Outlook: \n|----------------|------|-------------------------------------|\n| CVE-ID | CVSS | Impact |\n|----------------|------|-------------------------------------|\n| CVE-2026-21260 | 7.50 | Voordoen als andere gebruiker | \n| CVE-2026-21511 | 7.50 | Voordoen als andere gebruiker | \n|----------------|------|-------------------------------------|\n```",
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"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
}
],
"title": "CVE-2026-21261"
},
{
"cve": "CVE-2026-21260",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
},
"notes": [
{
"category": "other",
"text": "Exposure of Sensitive Information to an Unauthorized Actor",
"title": "CWE-200"
},
{
"category": "description",
"text": "A vulnerability in Microsoft Office Outlook allows unauthorized attackers to exploit sensitive information, facilitating spoofing attacks over a network.",
"title": "Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-1",
"CSAFPID-2",
"CSAFPID-3",
"CSAFPID-4",
"CSAFPID-5",
"CSAFPID-6",
"CSAFPID-7",
"CSAFPID-8",
"CSAFPID-9",
"CSAFPID-10",
"CSAFPID-11",
"CSAFPID-12",
"CSAFPID-13",
"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-21260 | NCSC-NL Website",
"url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-21260.json"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"CSAFPID-1",
"CSAFPID-2",
"CSAFPID-3",
"CSAFPID-4",
"CSAFPID-5",
"CSAFPID-6",
"CSAFPID-7",
"CSAFPID-8",
"CSAFPID-9",
"CSAFPID-10",
"CSAFPID-11",
"CSAFPID-12",
"CSAFPID-13",
"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
}
],
"title": "CVE-2026-21260"
},
{
"cve": "CVE-2026-21511",
"cwe": {
"id": "CWE-502",
"name": "Deserialization of Untrusted Data"
},
"notes": [
{
"category": "other",
"text": "Deserialization of Untrusted Data",
"title": "CWE-502"
},
{
"category": "description",
"text": "Deserialization of untrusted data in Microsoft Office Outlook can allow attackers to execute spoofing attacks over a network.",
"title": "Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-1",
"CSAFPID-2",
"CSAFPID-3",
"CSAFPID-4",
"CSAFPID-5",
"CSAFPID-6",
"CSAFPID-7",
"CSAFPID-8",
"CSAFPID-9",
"CSAFPID-10",
"CSAFPID-11",
"CSAFPID-12",
"CSAFPID-13",
"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-21511 | NCSC-NL Website",
"url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-21511.json"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"CSAFPID-1",
"CSAFPID-2",
"CSAFPID-3",
"CSAFPID-4",
"CSAFPID-5",
"CSAFPID-6",
"CSAFPID-7",
"CSAFPID-8",
"CSAFPID-9",
"CSAFPID-10",
"CSAFPID-11",
"CSAFPID-12",
"CSAFPID-13",
"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
}
],
"title": "CVE-2026-21511"
},
{
"cve": "CVE-2026-21514",
"cwe": {
"id": "CWE-807",
"name": "Reliance on Untrusted Inputs in a Security Decision"
},
"notes": [
{
"category": "other",
"text": "Reliance on Untrusted Inputs in a Security Decision",
"title": "CWE-807"
},
{
"category": "description",
"text": "Microsoft Office Word contains a vulnerability that allows unauthorized attackers to elevate privileges locally by exploiting untrusted inputs in security decisions.",
"title": "Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-1",
"CSAFPID-2",
"CSAFPID-3",
"CSAFPID-4",
"CSAFPID-5",
"CSAFPID-6",
"CSAFPID-7",
"CSAFPID-8",
"CSAFPID-9",
"CSAFPID-10",
"CSAFPID-11",
"CSAFPID-12",
"CSAFPID-13",
"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-21514 | NCSC-NL Website",
"url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-21514.json"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C",
"version": "3.1"
},
"products": [
"CSAFPID-1",
"CSAFPID-2",
"CSAFPID-3",
"CSAFPID-4",
"CSAFPID-5",
"CSAFPID-6",
"CSAFPID-7",
"CSAFPID-8",
"CSAFPID-9",
"CSAFPID-10",
"CSAFPID-11",
"CSAFPID-12",
"CSAFPID-13",
"CSAFPID-14",
"CSAFPID-15",
"CSAFPID-16",
"CSAFPID-17",
"CSAFPID-18",
"CSAFPID-19",
"CSAFPID-20",
"CSAFPID-21",
"CSAFPID-22",
"CSAFPID-23",
"CSAFPID-24",
"CSAFPID-25"
]
}
],
"title": "CVE-2026-21514"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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