How severe is CVE-2025-2866?

CVE-2025-2866 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2025-2866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-2866?

CVE-2025-2866 primarily affects Libreoffice. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-2866?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-2866 have an EU (EUVD) identifier?

Yes. CVE-2025-2866 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12434.

When was CVE-2025-2866 published?

CVE-2025-2866 was published on 2025-04-27 and last updated on 2026-06-17.

CVE-2025-2866

CVE-2025-2866 is a medium-severity vulnerability in Libreoffice with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v4: 2.4
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12434
Weakness: CWE-347
Affected product: Libreoffice
Published: 2025-04-27
Last modified: 2026-06-17

Description

Improper Verification of Cryptographic Signature vulnerability in LibreOffice allows PDF Signature Spoofing by Improper Validation. In the affected versions of LibreOffice a flaw in the verification code for adbe.pkcs7.sha1 signatures could cause invalid signatures to be accepted as valid This issue affects LibreOffice: from 24.8 before < 24.8.6, from 25.2 before < 25.2.2.

Frequently asked questions

What is CVE-2025-2866?: Improper Verification of Cryptographic Signature vulnerability in LibreOffice allows PDF Signature Spoofing by Improper Validation. In the affected versions of LibreOffice a flaw in the verification code for adbe.pkcs7.sha1 signatures could cause invalid signatures to be accepted as valid This issue affects LibreOffice: from 24.8 before < 24.8.6, from 25.2 before < 25.2.2.
How severe is CVE-2025-2866?: CVE-2025-2866 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2025-2866 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-2866?: CVE-2025-2866 primarily affects Libreoffice. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-2866?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-2866 have an EU (EUVD) identifier?: Yes. CVE-2025-2866 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12434.
When was CVE-2025-2866 published?: CVE-2025-2866 was published on 2025-04-27 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:*
cpe:2.3:a:libreoffice:libreoffice:24.8.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:libreoffice:libreoffice:24.8.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:libreoffice:libreoffice:25.2.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:libreoffice:libreoffice:25.2.0.0:beta1:*:*:*:*:*:*

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