usercp_register.php in phpBB 2.0.17 allows remote attackers to modify regular expressions and execute PHP code via the signature_bbcode_uid
usercp_register.php in phpBB 2.0.17 allows remote attackers to modify regular expressions and execute PHP code via the signature_bbcode_uid parameter, as demonstrated by injecting an "e" modifier into a preg_replace statement.
- Published
- Nov 1, 2005
- Updated
- Jun 16, 2026
- EPSS
- 2.4% · 83th percentile
- CWE
- —
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| phpbb group | phpbb | cpe:2.3:a:phpbb_group:phpbb |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- phpbb group phpbb2.0_beta1
- phpbb group phpbb2.0_rc1
- phpbb group phpbb2.0_rc2
- phpbb group phpbb2.0_rc3
- phpbb group phpbb2.0_rc4
- phpbb group phpbb2.0.0
- phpbb group phpbb2.0.1
- phpbb group phpbb2.0.10
- phpbb group phpbb2.0.11
- phpbb group phpbb2.0.12
- phpbb group phpbb2.0.13
- phpbb group phpbb2.0.14
- phpbb group phpbb2.0.15
- phpbb group phpbb2.0.16
- phpbb group phpbb2.0.17
- phpbb group phpbb2.0.2
- phpbb group phpbb2.0.3
- phpbb group phpbb2.0.4
- phpbb group phpbb2.0.5
- phpbb group phpbb2.0.6
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:3.1 | phpbb2 | before 2.0.13+1-6sarge2 | 2.0.13+1-6sarge2 |
Same product
phpbb group: all recordsOther highest-scoring records for the same primary product.
- CVE-2005-2086PHP remote file inclusion vulnerability in viewtopic.php in phpBB 2.0.15 and earlier allows remote attackers to execute arbitrary PHP code.56Plan
- CVE-2004-1315viewtopic.php in phpBB 2.x before 2.0.11 improperly URL decodes the highlight parameter when extracting words and phrases to highlight, whic52Plan
- CVE-2002-0473db.php in phpBB 2.0 (aka phpBB2) RC-3 and earlier allows remote attackers to execute arbitrary code from remote servers via the phpbb_root_p42Plan
- CVE-2007-1695PHP remote file inclusion vulnerability in includes/usercp_register.php in phpBB 2.0.19 allows remote attackers to execute arbitrary PHP cod41Plan
- CVE-2002-1537admin_ug_auth.php in phpBB 2.0.0 allows local users to gain administrator privileges by directly calling admin_ug_auth.php with modifed form41Plan
- CVE-2002-2176SQL injection vulnerability in Gender MOD 1.1.3 allows remote attackers to gain administrative access via the user_level parameter in the Us41Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:phpbb2 | 2.0.13+1-6sarge2 · Debian:3.1 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- P
Weakness class (CWE)
—
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- marc.info/?l=bugtraq&m=113081113317600&w=2
- secunia.com/advisories/17366
- secunia.com/advisories/18098
- securityreason.com/securityalert/130
- securitytracker.com/id?1015121
- www.debian.org/security/2005/dsa-925
- www.hardened-php.net/advisory_172005.75.html
- www.osvdb.org/20391
- www.securityfocus.com/bid/15243
- www.vupen.com/english/advisories/2005/2250
Vendor advisories and official records. Exploit/PoC links are deliberately left out.