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CVE Record

CVE-2021-39209: Bypassable CSRF protection

GLPI is a free Asset and IT management software package. In versions prior to 9.5.6, a user who is logged in to GLPI can bypass Cross-Site Request Forgery (CSRF) protection in many places. This could allow a malicious actor to perform many actions on GLPI. This issue is fixed in version 9.5.6. There are no workarounds aside from upgrading.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

GLPI versions before 9.5.6 have CSRF protection that can be bypassed in many areas. A logged-in user context could be abused to make GLPI perform unauthorized actions, potentially affecting sensitive IT asset and service management data.

Executive priority

Prioritize remediation for any GLPI instance below 9.5.6, especially if it supports IT operations or asset management. The vendor names no workaround other than upgrading.

Technical view

CVE-2021-39209 is a CWE-352 CSRF protection bypass in glpi-project GLPI before 9.5.6. The supplied CVSS 3.1 score is 8.8, with network attack vector, low complexity, low privileges required, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is limited to GLPI deployments running versions earlier than 9.5.6. Risk is higher where GLPI is broadly reachable and contains operationally sensitive inventory, ticketing, user, or asset-management data.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The advisory states a logged-in GLPI user can bypass CSRF protection in many places, but it does not provide endpoint-level detail.

Researcher notes

Evidence is sufficient for affected version range, severity, and fixed version. It is incomplete for exploitation in the wild, affected endpoints, and precise action classes. Avoid assuming more than a broad CSRF bypass across many GLPI locations.

Mitigation direction

  • Upgrade GLPI to version 9.5.6 or later.
  • Treat older GLPI instances as vulnerable until verified otherwise.
  • Check official GLPI guidance if upgrade timing is constrained.
  • Review privileged GLPI account activity after remediation.

Validation and detection

  • Inventory GLPI instances and record their exact versions.
  • Confirm all production and staging instances are at least 9.5.6.
  • Review access paths to GLPI, including internet and VPN exposure.
  • Check logs for unusual administrative or configuration changes.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

CWE-352: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookup
cve · low confidence lookup

CVE-2021-39209 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2021-39209Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
glpi-projectglpi< 9.5.6Listed
Weakness

CWE details

CWE-352

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-352 · source CWE mapping

Cross-Site Request Forgery (CSRF)

Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs