Security readout for executives and security teams
Plain-English summary
Pimcore before 10.1.3 can reveal whether a username exists through different forgot password responses. This does not directly compromise accounts, but it helps attackers build valid user lists for phishing, password guessing, or credential stuffing.
Executive priority
Treat as a moderate-priority remediation. It is not a direct system takeover issue, but it can materially improve attacker targeting against Pimcore users.
Technical view
CVE-2021-39189 is a CWE-204 observable response discrepancy in Pimcore's lost password service. Unauthenticated network users can infer valid usernames from response differences. The CVSS 3.1 score is 5.3, with low confidentiality impact and no integrity or availability impact stated.
Likely exposure
Exposure is limited to Pimcore installations running versions earlier than 10.1.3, especially where the forgot password function is reachable by untrusted users.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is low-complexity and unauthenticated, but supports reconnaissance rather than direct compromise.
Researcher notes
The core condition is response discrepancy in account recovery. Validation should confirm version and patch state without collecting real user lists or performing broad enumeration. Public sources identify the fixed version and patch availability.
Mitigation direction
- Upgrade Pimcore to version 10.1.3 or later.
- If upgrade is delayed, apply the vendor patch manually.
- Review Pimcore's security advisory before production rollout.
- Prioritize internet-facing password reset services first.
Validation and detection
- Inventory Pimcore deployments and confirm installed versions.
- Verify affected systems are upgraded to at least 10.1.3.
- Review dependency or deployment records for manual patch application.
- Check whether forgot password endpoints are publicly reachable.
- Monitor password reset activity for unusual enumeration patterns.
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-204: 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39189 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/pimcore/pimcore/security/advisories/GHSA-579x-cjvr-cqj9CVE reference · x_refsource_CONFIRM
- https://github.com/pimcore/pimcore/pull/10223.patchCVE reference · x_refsource_MISC
- https://github.com/pimcore/pimcore/pull/10223/commits/d0a4de39cf05dce6af71f8ca039132bdfcbb0dceCVE reference · x_refsource_MISC
- https://huntr.dev/bounties/12462a99-ebf8-4e39-80b3-54a16caa3f4c/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.
Observable Response Discrepancy
Observable Response Discrepancy represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.