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CVE-2026-45106 WeblateOrg CVE debrief

CVE-2026-45106 is a MEDIUM severity vulnerability in Weblate, a web-based localization tool. Prior to version 2026.5, Weblate's live search preview renders unit source and context as HTML without escaping. This allows any contributor whose content reaches those fields to store HTML and CSS that runs inside the authenticated editor of every user who runs a matching search. The vulnerability has been patched in version 2026.5.

Vendor
WeblateOrg
Product
weblate
CVSS
MEDIUM 4.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-10
Advisory published
2026-06-10
Advisory updated
2026-06-10

Who should care

Users of Weblate, especially those allowing user-submitted content, should be aware of this vulnerability and upgrade to version 2026.5 or later.

Technical summary

The vulnerability is caused by the lack of HTML escaping in Weblate's live search preview feature. This allows an attacker to inject malicious HTML and CSS code, which can be executed by other users who run a search matching the injected content.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Weblate version 2026.5 or later.
  • Review user-submitted content for suspicious HTML or CSS code.
  • Consider implementing additional security measures, such as Content Security Policy (CSP).

Evidence notes

The vulnerability has a CVSS score of 4.6 and is classified as CWE-79: Improper Neutralization of Input During Web Page Generation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45106 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45106

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45106 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45106

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.