Security readout for executives and security teams
Plain-English summary
CVE-2022-31358 is a reflected XSS flaw in Proxmox Virtual Environment before v7.2-3. An attacker could cause script or HTML to run in a user’s browser through crafted access to certain API paths. Because Proxmox often manages critical virtualization infrastructure, compromise of an administrator session could have serious operational impact.
Executive priority
Prioritize remediation for internet-reachable or broadly accessible Proxmox management systems. This is a high-impact control-plane issue because successful browser-session compromise could affect virtualized workloads, but current sources do not confirm active exploitation.
Technical view
The CVE describes CWE-79 reflected XSS in Proxmox VE prior to v7.2-3, affecting non-existent endpoints under /api2/html/. CVSS 3.1 is 9.0 with network access, low complexity, low privileges, required user interaction, and changed scope. The record says arbitrary web scripts or HTML may execute remotely.
Likely exposure
Organizations running Proxmox VE versions before 7.2-3 are the named exposure. Risk is highest where the Proxmox web interface is reachable by many users or from untrusted networks. The CVE metadata does not provide complete CPE or package inventory details.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle, and no cited source states active exploitation. The CVSS vector indicates exploitation requires a logged-in attacker and user interaction, such as a victim opening attacker-controlled content.
Researcher notes
Affected-version data is clear at a high level: Proxmox VE before v7.2-3. The CVE record lacks detailed CPEs. Analysis should focus on patch presence in pve-http-server and exposure of the web management interface. Avoid assuming exploit activity without additional evidence.
Mitigation direction
- Upgrade affected Proxmox VE systems to v7.2-3 or later.
- Review Proxmox guidance and the referenced pve-http-server commit for fix details.
- Restrict Proxmox management UI access to trusted networks and administrators.
- Reduce low-privilege accounts with access to the Proxmox web interface.
Validation and detection
- Inventory Proxmox VE versions and identify systems older than v7.2-3.
- Confirm the pve-http-server package includes the referenced fix commit.
- Review access logs for unusual requests involving /api2/html/ non-existent endpoints.
- Verify management interfaces are not exposed to untrusted networks.
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-79: 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 lookupCVE-2022-31358 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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.
SSVC decision data
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:L/UI:R/S:C/C:H/I:H/A:H2.36CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.proxmox.com/?p=pve-http-server.git;a=commitdiff;h=00661f1223b7c0afffa64e1d91f5e018b985f762CVE reference, mitre
- https://www.proxmox.com/en/CVE reference, mitre
- https://starlabs.sg/blog/2022/12-multiple-vulnerabilites-in-proxmox-ve--proxmox-mail-gateway/CVE reference, mitre
- https://git.proxmox.com/?p=pve-http-server.git%3Ba=commitdiff%3Bh=00661f1223b7c0afffa64e1d91f5e018b985f762CVE reference, CVE · x_transferred
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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.