# CVE-2026-53525

## Summary

- **CVE ID:** CVE-2026-53525
- **Severity:** HIGH
- **CVSS Score:** 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H)
- **CWE:** CWE-208
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 25, 2026

## Description

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.

## Affected Products

- weechat — weechat (>= 0.3.4, < 4.9.1)

## References

- [CNA](https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._