Security readout for executives and security teams
Plain-English summary
GLPI before 9.5.6 exposed its “remember me” autologin cookie to browser scripts. If a malicious GLPI plugin could run script in the application, it could steal that cookie and reuse it for autologin. Version 9.5.6 fixes the issue; avoiding “remember me” is the documented workaround.
Executive priority
Treat as a moderate confidentiality risk. Prioritize GLPI upgrades where the platform handles sensitive asset, user, or service-management data, or where plugins are broadly enabled.
Technical view
This is CWE-1004: the autologin cookie was accessible to scripts in GLPI versions before 9.5.6. The CVSS 3.1 score is 6.5 with high confidentiality impact, low attack complexity, required low privileges, and no user interaction. The source bundle identifies GLPI only.
Likely exposure
Organizations running GLPI versions earlier than 9.5.6 are exposed, especially where users enable “remember me” and third-party or untrusted plugins are installed.
Exploitation context
The sources describe a malicious plugin stealing the script-accessible autologin cookie. The bundle does not identify public exploitation, and CISA KEV status is false, so active exploitation is not established here.
Researcher notes
Evidence is limited to GLPI before 9.5.6, an autologin cookie accessible to scripts, and a malicious-plugin theft scenario. Do not generalize to other GLPI cookies or products without vendor evidence.
Mitigation direction
- Upgrade GLPI to version 9.5.6 or later.
- Disable or avoid the “remember me” feature until patched.
- Review installed GLPI plugins for trust and necessity.
- Check current GLPI vendor guidance before operational changes.
Validation and detection
- Inventory GLPI instances and confirm their exact versions.
- Verify exposed instances are running 9.5.6 or later.
- Confirm “remember me” is disabled on unpatched instances.
- Review plugin inventory against approved sources.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CWE-1004: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-39210 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
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/glpi-project/glpi/releases/tag/9.5.6CVE reference · x_refsource_MISC
- https://github.com/glpi-project/glpi/security/advisories/GHSA-hwxq-4c5f-m4v2CVE reference · x_refsource_CONFIRM
- https://huntr.dev/bounties/b2e99a41-b904-419f-a274-ae383e4925f2/CVE reference · x_refsource_MISC
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.
Sensitive Cookie Without 'HttpOnly' Flag
Sensitive Cookie Without 'HttpOnly' Flag represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.