Analyst readout for executives and security teams
Plain-English summary
CVE-2016-9850 affects older phpMyAdmin releases. A flaw in username matching for allow/deny rules can cause incorrect rule matches, and timing differences may reveal whether a username appears in a rule. The main concern is misapplied access controls on database administration interfaces.
Executive priority
Prioritize remediation for internet-accessible or shared administrative phpMyAdmin deployments. Treat internal, tightly restricted instances as lower urgency, but still update during the next maintenance window because the flaw affects access-control decisions.
Technical view
phpMyAdmin 4.6.x before 4.6.5, 4.4.x before 4.4.15.9, and 4.0.x before 4.0.10.18 are affected. The issue involves non-constant-time username checks and incorrect allow/deny rule matching. Sources do not provide CVSS, CWE, or detailed exploitation prerequisites.
Likely exposure
Exposure is most likely where legacy phpMyAdmin versions remain deployed, especially instances relying on allow/deny username rules for access decisions. The bundle does not identify affected downstream packages beyond cited Gentoo and Debian advisories.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Public references describe the weakness, affected version ranges, and security updates, but do not establish observed in-the-wild abuse.
Researcher notes
The evidence supports a timing side-channel and incorrect username rule matching in specified phpMyAdmin branches. The bundle lacks CVSS, CWE, exploit maturity, and precise impact beyond rule mismatch and username detection, so avoid claiming authentication bypass or active exploitation without additional vendor evidence.
Mitigation direction
- Upgrade phpMyAdmin 4.6.x to 4.6.5 or later.
- Upgrade phpMyAdmin 4.4.x to 4.4.15.9 or later.
- Upgrade phpMyAdmin 4.0.x to 4.0.10.18 or later.
- Use distribution security updates where phpMyAdmin is OS-packaged.
- Check current phpMyAdmin vendor guidance before changing production controls.
Validation and detection
- Inventory all phpMyAdmin instances and record exact versions.
- Check whether allow/deny username rules are configured.
- Confirm installed versions are not in the affected ranges.
- Review Gentoo or Debian advisory status if using those packages.
- Confirm compensating access controls do not rely only on affected rule matching.
Public sources used
Based on public source material and reviewed before publication.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2016-9850 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.phpmyadmin.net/security/PMASA-2016-61CVE reference · x_refsource_CONFIRM
- 94529CVE reference · vdb-entry, x_refsource_BID
- GLSA-201701-32CVE reference · vendor-advisory, x_refsource_GENTOO
- [debian-lts-announce] 20190617 [SECURITY] [DLA 1821-1] phpmyadmin security updateCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.