CVE-2011-5277: Multiple SQL injection vulnerabilities in signature.php in the Advanced Forum Signatures (aka afsignatures) pl

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HIGH 7.5DOWNGRADE

CVE-2011-5277 is a high-severity flaw (CVSS 7.5) affecting advanced forum signatures. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple SQL injection vulnerabilities in signature.php in the Advanced Forum Signatures (aka afsignatures) plugin 2.0.4 for MyBB allow remote attackers to execute arbitrary SQL commands via the (1) afs_type, (2) afs_background, (3) afs_showonline, (4) afs_bar_left, (5) afs_bar_center, (6) afs_full_line1, (7) afs_full_line2, (8) afs_full_line3, (9) afs_full_line4, (10) afs_full_line5, or (11) afs_full_line6 parameter. NOTE: the provenance of thi

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-89
Published	2014-04-08
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: advanced forum signatures project

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-04-08 14:22 UTCPublished CVE record published
2026-06-16 23:36 UTCUpdated Record last modified

advanced forum signatures project advanced forum signatures DOWNGRADE

Affected: 2.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.4

1. Check installed version

apt-cache policy advanced-forum-signatures || rpm -q advanced-forum-signatures || advanced-forum-signatures --version

2. No fixed release: DOWNGRADE to a release before 2.0.4 (Debian / Ubuntu)

apt-cache madison advanced-forum-signatures sudo apt install advanced-forum-signatures=<VERSION_BEFORE_2.0.4> sudo apt-mark hold advanced-forum-signatures

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list advanced-forum-signatures sudo dnf downgrade advanced-forum-signatures-<VERSION_BEFORE_2.0.4> sudo dnf versionlock add advanced-forum-signatures

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: MyBB Advanced Forum Signatures - 'afsignatures-2.0.4' SQL Injection

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-5277?

advanced forum signatures: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-5277 being exploited?

CVE-2011-5277 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-5277 affect?

CVE-2011-5277 affects advanced forum signatures. Severity is high (CVSS 7.5). Multiple SQL injection vulnerabilities in signature.php in the Advanced Forum Signatures (aka afsignatures) plugin 2.0.4 for MyBB allow remote attackers to execute arbitrary SQL commands via the (1) afs_type, (2) afs_background, (3) afs_sho

How urgent is CVE-2011-5277?

Priority 48/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2011-5278 HIGH 7.5 DOWNGRADE SQL injection vulnerability in signature.php in Advanced Forum Signatures plugin (aka afsignatures) 2.0.4 for

References

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