CVE-2026-9733: HAYAJO Mojolicious::Plugin::Web::Auth::OAuth2 · Generation of Predictable Numbers or Identifiers
Affects HAYAJO Mojolicious::Plugin::Web::Auth::OAuth2Source CVE Database V5
Not known to be exploited · CVSS 9.1 Critical.
Data as of 5 Nov 2026, 00:01 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 23 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| HAYAJOMojolicious::Plugin::Web::Auth::OAuth2 | Affected
| Fixed in– |
GitHubMojolicious-Plugin-Web-Authpkg:github/Mojolicious-Plugin-Web-AuthOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should avoid relying on the default state generator and instead specify a custom, cryptographically secure state generator when constructing the plugin. Monitor the vendor advisory for updates and apply any official fixes once available.
Description
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter. When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function. A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).
References
- metacpan.org/release/HAYAJO/Mojolicious-Plugin-Web-Auth-0.17/source/lib/Mojolicious/Plugin/Web/Auth/OAuth2.pm (opens in a new tab)
- datatracker.ietf.org/doc/html/rfc6749 (opens in a new tab)
- security.metacpan.org/patches/M/Mojolicious-Plugin-Web-Auth/0.17/CVE-2026-9733-r2.patch (opens in a new tab)
- openwall.com/lists/oss-security/2026/06/23/1 (opens in a new tab)