Security readout for executives and security teams
Plain-English summary
CVE-2026-27369 affects the BoldThemes Celeste WordPress theme through version 1.3.6. It involves unsafe handling of serialized data, which can let attackers influence PHP objects. The CVSS score is 8.1, but exploitation complexity is high. No provided source confirms active exploitation or a fixed version.
Executive priority
Prioritize validation this week for public WordPress properties. The issue can have severe business impact if exploitable, but current evidence does not show confirmed active exploitation. Focus first on externally reachable sites running Celeste <=1.3.6.
Technical view
The CVE describes CWE-502 deserialization of untrusted data in Celeste, enabling PHP object injection. The CVSS vector is AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H, meaning network-reachable, unauthenticated exploitation with high confidentiality, integrity, and availability impact if successful. Affected versions are reported as Celeste <=1.3.6.
Likely exposure
Internet-facing WordPress sites using the BoldThemes Celeste theme version 1.3.6 or earlier are the primary concern. Exposure depends on whether the vulnerable theme is installed and reachable. The provided data does not identify affected hosting platforms, dependencies, or prerequisite configurations beyond the theme/version.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle, and no cited source confirms active exploitation. The high attack complexity suggests exploitation may require specific application conditions or usable gadget chains. Do not assume compromise solely from installation, but treat confirmed vulnerable deployments as high priority.
Researcher notes
Public details are limited to a Patchstack database entry and CVE metadata. The affected range is stated as through 1.3.6, but no exploit conditions, proof of concept, or fixed version are included in the provided bundle. Avoid weaponized testing; use safe inventory and version validation.
Mitigation direction
- Inventory WordPress sites for the BoldThemes Celeste theme and installed version.
- If Celeste is <=1.3.6, check BoldThemes and Patchstack for current vendor guidance.
- Apply any vendor-provided fixed version when confirmed available.
- If no fix is available, consider replacing or removing the theme after business testing.
- Increase monitoring for suspicious WordPress errors, object injection indicators, and unexpected file changes.
Validation and detection
- Confirm whether the Celeste theme is installed on each WordPress site.
- Record the exact theme version and compare it to <=1.3.6.
- Review Patchstack and CVE records for updated affected-version or remediation details.
- Verify any applied update changes Celeste beyond the vulnerable version range.
- Check security tooling alerts for PHP object injection or deserialization findings.
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-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process 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 lookupCVE-2026-27369 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
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
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.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.