CVE-2026-77508Network attack vectorHinoki check available

Team permission gains via unverified email changes

Published Aug 26, 2026 · Updated Aug 27, 2026

Improper workflow enforcement in Weblate before 2026.8 allows remote authenticated users to gain team permissions through its REST API. The /api/users/{username}/ endpoint writes an email supplied in PUT or PATCH requests without limiting it to addresses verified for that account. Exploitation requires an ordinary account and a later administrator invitation to the substituted address; acceptance grants that team's project permissions without mailbox access.

CVSS severity4.3
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Improper workflow enforcement in Weblate before 2026.8 allows remote authenticated users to gain team permissions through its REST API. The /api/users/{username}/ endpoint writes an email supplied in PUT or PATCH requests without limiting it to addresses verified for that account. Exploitation requires an ordinary account and a later administrator invitation to the substituted address; acceptance grants that team's project permissions without mailbox access.

The record

CVE
CVE-2026-77508
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
Weblate
Product
Weblate
Classifications
CWE-302, CWE-841, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Weblate · Weblateversion=< 2026.8

Published CVSS scores

3.5GitHub CNA CVE RecordCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.3Weblate GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-302Authentication Bypass by Assumed-Immutable Data
CWE-841Improper Enforcement of Behavioral Workflow
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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