Security readout for executives and security teams
Plain-English summary
CVE-2021-43778 affects GLPI sites that installed the Barcode plugin version 2.x before 2.6.1. An unauthenticated attacker could abuse path traversal in the plugin to access or alter sensitive server-side content. The issue is critical because exploitation requires network access only, with no login or user interaction.
Executive priority
Prioritize remediation for any externally reachable GLPI instance using the Barcode plugin. The flaw is critical, unauthenticated, and patched, so the business decision should be rapid upgrade or temporary removal of the vulnerable file.
Technical view
The Barcode plugin for GLPI versions >=2.0.0 and <2.6.1 contains a CWE-22 path traversal flaw in front/send.php. The CVSS 3.1 score is 9.1, with network attack vector, low complexity, no privileges, no user interaction, high confidentiality impact, high integrity impact, and no availability impact.
Likely exposure
Exposure is limited to GLPI deployments with the pluginsGLPI barcode plugin installed in versions 2.0.0 through 2.6.0. Systems are especially exposed where the GLPI application or plugin route is reachable from untrusted networks.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. It does include public exploit-related repository references, so defenders should treat internet-reachable affected GLPI instances as higher risk even without confirmed exploitation evidence.
Researcher notes
Evidence supports affected versions, vulnerable component, CVSS severity, patch version, and workaround. The bundle does not prove active exploitation. Public exploit references increase validation urgency, but offensive reproduction details should not be needed for asset exposure confirmation.
Mitigation direction
- Upgrade the GLPI Barcode plugin to version 2.6.1 or later.
- If immediate upgrade is not possible, delete front/send.php as the published workaround.
- Restrict network access to GLPI until remediation is complete.
- Check vendor advisory and release notes for any newer guidance.
- Review file integrity and sensitive file access logs after remediation.
Validation and detection
- Inventory GLPI instances and confirm whether the Barcode plugin is installed.
- Verify installed Barcode plugin versions are not below 2.6.1.
- Confirm front/send.php is removed where the workaround was used.
- Review web server logs for suspicious requests targeting plugin barcode paths.
- Confirm compensating access controls restrict untrusted network reachability.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-43778 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
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:N/UI:N/S:U/C:H/I:H/A:N3.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/pluginsGLPI/barcode/security/advisories/GHSA-2pjh-h828-wcw9CVE reference · x_refsource_CONFIRM
- https://github.com/pluginsGLPI/barcode/commit/428c3d9adfb446e8492b1c2b7affb3d34072ff46CVE reference · x_refsource_MISC
- https://github.com/hansmach1ne/MyExploits/tree/main/Path%20Traversal%20in%20GLPI%20Barcode%20pluginCVE reference · x_refsource_MISC
- https://github.com/pluginsGLPI/barcode/releases/tag/2.6.1CVE reference · x_refsource_MISC
- https://github.com/hansmach1ne/CVE-portfolio/tree/main/CVE-2021-43778CVE reference
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.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.