Security readout for executives and security teams
Plain-English summary
Manyfold before 0.133.0 can leak session cookies through proxy caches, which could let another person take over a user session. This matters most for self-hosted deployments placed behind caching proxies. The published fix is Manyfold 0.133.0. No provided source indicates active exploitation.
Executive priority
Prioritize remediation for externally reachable Manyfold deployments or environments with shared proxy caching. The issue is not described as actively exploited, but session hijack risk can directly affect user trust and data confidentiality. Upgrade during the next practical maintenance window, faster for exposed systems.
Technical view
CVE-2026-27933 affects manyfold3d Manyfold versions before 0.133.0. The issue is described as session hijack via cookie leakage in proxy caches, mapped to CWE-613. CVSS 3.1 is 6.8 with network attack vector, high attack complexity, no privileges required, user interaction required, and high confidentiality and integrity impact.
Likely exposure
Exposure is likely limited to self-hosted Manyfold instances running versions earlier than 0.133.0, especially where reverse proxies or caching layers may store responses involving session cookies. Internet-facing deployments have higher business concern than private, tightly controlled instances.
Exploitation context
The CVSS vector indicates remote reachability but high complexity and required user interaction. Successful abuse could compromise account sessions and affect confidentiality and integrity. The source bundle does not report public exploitation, proof-of-concept availability, or CISA KEV listing.
Researcher notes
Key unknowns remain from the provided bundle: exact cache behavior, trigger conditions, and whether session invalidation is needed after upgrade. Avoid assuming exploitability without proxy context. Validate affected version and architecture before assigning urgency beyond the published medium severity.
Mitigation direction
- Upgrade Manyfold to version 0.133.0 or later.
- Review the GitHub security advisory for vendor-specific guidance.
- Identify caching proxies in front of Manyfold and review their handling of authenticated responses.
- If upgrade timing is delayed, reduce external exposure where operationally feasible.
Validation and detection
- Inventory Manyfold deployments and confirm installed versions.
- Flag any Manyfold version earlier than 0.133.0 as affected.
- Document whether deployments sit behind reverse proxies or caching layers.
- Confirm remediation by verifying the application reports version 0.133.0 or later.
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-613: 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-2026-27933 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
- 6.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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:H/PR:N/UI:R/S:U/C:H/I:H/A:N1.65.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.8MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/manyfold3d/manyfold/security/advisories/GHSA-g949-hmvj-2r76CVE reference · x_refsource_CONFIRM
- https://github.com/manyfold3d/manyfold/releases/tag/v0.133.0CVE 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.
Insufficient Session Expiration
Insufficient Session Expiration represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.