CVE-2026-22659Public exploitNetwork attack vector

Cross-forum topic modification via first-result authorization

Published Jul 10, 2026 · Updated Jul 10, 2026

Authorization bypass in FlaskBB 2.2.0 and earlier allows remote authenticated users to alter topics outside forums they moderate. The do_topic_action helper checks IsAtleastModeratorInForum only against topics[0].forum after a batch query accepts topic IDs from multiple forums. Moderator access to one forum and a lower-ID anchor topic are required; successful requests can lock, unlock, hide, or delete other forums' topics.

CVSS severity7.2
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in FlaskBB 2.2.0 and earlier allows remote authenticated users to alter topics outside forums they moderate. The do_topic_action helper checks IsAtleastModeratorInForum only against topics[0].forum after a batch query accepts topic IDs from multiple forums. Moderator access to one forum and a lower-ID anchor topic are required; successful requests can lock, unlock, hide, or delete other forums' topics.

The record

CVE
CVE-2026-22659
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
FlaskBB
Product
FlaskBB
Classifications
CWE-863, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlaskBB · FlaskBBversion=0 <=2.2.0

Published CVSS scores

7.2GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
8.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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