Security readout for executives and security teams
Plain-English summary
This is a cross-site scripting risk in Rails HTML sanitization, but only for applications that changed the sanitizer allowlist in a specific unsafe way. If user-supplied HTML is rendered after allowing style with math or svg, injected content may survive sanitization. The fixed version is rails-html-sanitizer 1.4.4.
Executive priority
Treat as high priority for Rails applications that accept or display user-controlled HTML with customized sanitizer rules. Organizations using default sanitizer settings or fixed versions have lower urgency, but should still confirm dependency versions and configuration.
Technical view
rails-html-sanitizer before 1.4.4 may allow XSS when Rails::Html::Sanitizer allowed tags are overridden to include both math and style, or both svg and style. The issue is CWE-79 with CVSS 3.1 score 7.2: AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
Likely exposure
Exposure is limited to Rails applications using rails-html-sanitizer below 1.4.4 with custom allowed tags matching the affected combinations. Sources state code is only impacted when allowed tags are overridden. Default sanitizer configurations are not described as affected in the provided sources.
Exploitation context
The CVE is not listed as KEV, and the provided source bundle does not state active exploitation. The CVSS vector indicates remote, unauthenticated, low-complexity exploitation without user interaction, but only where the vulnerable sanitizer configuration exists.
Researcher notes
The key differentiator is configuration: the vulnerable library version alone is not enough to prove exploitability. Validate the application’s actual sanitizer allowlist and data flow from untrusted HTML input to rendered output. No source in the bundle supports claiming active exploitation.
Mitigation direction
- Upgrade rails-html-sanitizer to version 1.4.4 or later.
- Remove style from overridden allowed tags if immediate upgrade is not possible.
- Alternatively remove math and svg from overridden allowed tags.
- Review vendor and distribution advisories for packaged dependency updates.
Validation and detection
- Inventory applications using rails-html-sanitizer versions before 1.4.4.
- Check sanitizer configuration for overridden allowed tags.
- Flag configurations allowing style with math or svg.
- Confirm dependency resolution actually loads the fixed sanitizer version.
- Review routes or features that render untrusted HTML fragments.
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-2022-23519 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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:C/C:L/I:L/A:N3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-9h9g-93gc-623hCVE reference · x_refsource_CONFIRM
- https://hackerone.com/reports/1656627CVE reference · x_refsource_MISC
- https://lists.debian.org/debian-lts-announce/2023/09/msg00012.htmlCVE reference
- https://lists.debian.org/debian-lts-announce/2024/09/msg00045.htmlCVE reference
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.