CVE-2026-72700 Grav before 3.9.1 Timing Attack via Non-Constant-Time Token Comparison
Timing attack in Grav login plugin allows token recovery via timing differences, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-72700?
CVE-2026-72700 is a high-severity vulnerability in getgrav grav, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The getgrav/grav-plugin-login Composer plugin before 3.9.1 (used by Grav) compares password reset and account activation tokens using a non-constant-time === string comparison instead of hash_equals() in classes/Controller.php (taskReset()) and login.php (activation handler). Because the token-submission endpoint (taskReset) also lacks rate limiting, an attacker could in principle send repeated token guesses against a known username and use the timing differences to attempt to recover a valid token, though the vendor rates the practical exploitability as low and no end-to-end network exploit has been demonstrated.
Weakness: CWE-208
Which versions are affected by CVE-2026-72700?
How do I fix CVE-2026-72700?
No fix has been published for CVE-2026-72700 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-72700 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-72700 exists.
Sources
Also known as GHSA-92vc-67q9-382j.