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VulnerabilityPublished

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

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Not known to be exploited · CVSS 9.1 Critical.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
HAYAJOMojolicious::Plugin::Web::Auth::OAuth2Affected
  • <=0.17
Fixed in–
GitHubMojolicious-Plugin-Web-Authpkg:github/Mojolicious-Plugin-Web-AuthOther threatsAffected
  • <=0.17
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

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