CVE-2026-77508: Weblate: Unverified REST API email changes

Severity: low (CVSS 3.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-26 · updated 2026-09-09
Weakness: CWE-302

Description

Weblate is a web based localization tool. Prior to 2026.8, an authenticated user can change the account's primary email through PUT or PATCH requests to /api/users/{username}/ without verifying the new address, allowing a later team invitation for that address to be accepted without access to the intended recipient's mailbox. This issue is fixed in version 2026.8.

Affected products

WeblateOrg weblate: before 2026.8

References

https://github.com/WeblateOrg/weblate/pull/20639
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-x84p-6892-473c

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