CVE-2026-73310
Medium
Description
XenForo before 2.3.13 contains an authorization flaw in the OAuth2 token endpoint that allows attackers controlling any allowlisted redirect URI to bypass redirect URI binding by submitting a different allowlisted URI than the one recorded at authorization time. Attackers can exchange an intercepted authorization code using a mismatched redirect URI to steal OAuth2 tokens from intercepted authorization flows.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Xenforo
PublishedSep 8, 2026
First seenSep 8, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- xenforo xenforo2.3.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xenforo xenforo | v < 2.3.13 | 2.3.13 |
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