CVE-2026-29199 json
phpBB has Password Reset Link Poisoning via Host Header injection
published 6mo ago modified last mo. also EUVD-2026-26892 , GHSA-7gm6-w7mx-58cr
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 16%
- public exploits
- 0
- none known
Summary
phpBB before 3.3.16 is vulnerable to Host Header Injection that can lead to password rest link poisoning. When force_server_vars is disabled, the servers hostname may be extracted from the HTTP Host header which is used to generate the password reset link URL. An attacker who can manipulate the Host header (e.g. through misconfigured host setup or missing header validation by the webserver) can cause password reset emails to contain a link pointing to an attacker-controlled domain, potentially leading to account takeover.
Patch / fix
- packagist phpbb/phpbb 3.3.16, 4.0.0-a2
Is CVE-2026-29199 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 6mo ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | phpbb/phpbb | >=3.0.0, <3.3.16 >=4.0.0-a1, <4.0.0-a2 |
3.3.16 4.0.0-a2 |
Affected products
- phpBB phpBB
Classification
- Weakness
-
- CWE-640 Weak Password Recovery Mechanism for Forgotten Password
References
-
hackerone.com
/reports/3543246
web, permissions-required
-
nvd.nist.gov
/vuln/detail/CVE-2026-29199
advisory
-
blog.phpbb.com
/2026/04/27/phpbb-4-0-0-a2-release
web
-
github.com
/phpbb/phpbb-app
package
-
phpbb.com
/community/viewtopic.php?t=2671024
web
Sources
- CVE List CVE-2026-29199
- GitHub Advisory GHSA-7gm6-w7mx-58cr
- NVD CVE-2026-29199
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.