How severe is CVE-2025-55166?

CVE-2025-55166 has a CVSS 4.0 base score of 5.1, rated medium severity.

Is CVE-2025-55166 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-55166?

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

Does CVE-2025-55166 have an EU (EUVD) identifier?

Yes. CVE-2025-55166 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24263.

When was CVE-2025-55166 published?

CVE-2025-55166 was published on 2025-08-12 and last updated on 2026-06-17.

CVE-2025-55166

CVE-2025-55166 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. 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-79.

Key facts

Severity: Medium (CVSS 4.0 base score 5.1)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24263
Weakness: CWE-79
Published: 2025-08-12
Last modified: 2026-06-17

Description

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to version 0.22.0, the sanitization logic in the cleanXlinkHrefs method only searches for lower-case attribute name, which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains. This issue has been patched in version 0.22.0.

Frequently asked questions

What is CVE-2025-55166?: savg-sanitizer is a PHP SVG/XML sanitizer. Prior to version 0.22.0, the sanitization logic in the cleanXlinkHrefs method only searches for lower-case attribute name, which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains. This issue has been patched in version 0.22.0.
How severe is CVE-2025-55166?: CVE-2025-55166 has a CVSS 4.0 base score of 5.1, rated medium severity.
Is CVE-2025-55166 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-55166?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-55166 have an EU (EUVD) identifier?: Yes. CVE-2025-55166 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24263.
When was CVE-2025-55166 published?: CVE-2025-55166 was published on 2025-08-12 and last updated on 2026-06-17.

References

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

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CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

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