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CVE-2026-73312

XenForo < 2.3.13 Refresh Token Replay via Expired Access Token

HIGH
7.4
CVSS Score
Published: September 8, 2026 at 01:16 PM UTC
Updated: October 1, 2026 at 03:20 PM UTC
1 product affected across 1 vendorXenForo

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Severity
HIGH7.4
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

XenForo before 2.3.13 contains a refresh token replay vulnerability that allows attackers to reuse a refresh token multiple times by exploiting the failure to mark tokens as consumed when the parent access token has expired. Attackers can repeatedly submit the same refresh token to generate additional independent token pairs, achieving persistent unauthorized access for the token's full lifetime.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

XenForo· Xenforo
95%
v < 2.3.13
Affected range stops below 2.3.13, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Vendor AdvisoryPatchRelease Notes
Source: cverecord
https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/
Release Notes
Source: cverecord
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/xenforo-refresh-token-replay-via-expired-access-token
Technical DescriptionExploitThird Party Advisory
Source: [email protected]
https://bombobombone.github.io/posts/cve-2026-73312/
ExploitThird Party Advisory
Source: [email protected]
https://github.com/BomboBombone/CVE-2026-73312

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHVulnCheck
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-294

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