Security readout for executives and security teams
Plain-English summary
2FAuth before 4.0.3 allows cross-site scripting through the account/service field during account creation. A malicious value could run script in a user’s browser when viewed, affecting confidentiality and availability according to the CVSS data. Organizations running self-hosted 2FAuth should upgrade, but there is no cited evidence of active exploitation.
Executive priority
Handle in the normal vulnerability remediation cycle, faster for shared or internet-accessible 2FAuth deployments. The issue is patched and medium severity, but it affects a security-sensitive application that stores 2FA account data.
Technical view
CVE-2023-36816 is CWE-79 XSS in Bubka 2FAuth versions before 4.0.3. The source identifies the account/service field as the injection point and states testing used a docker-compose environment. The CVSS 3.1 score is 6.1 with local attack vector, low complexity, no privileges, and required user interaction.
Likely exposure
Exposure is limited to organizations running Bubka 2FAuth versions older than 4.0.3. Risk is higher where untrusted or low-trust users can create or import account entries that others may later view.
Exploitation context
The provided sources do not show public exploitation or CISA KEV listing. Exploitation requires a user interaction condition in the CVSS vector. Treat this as a credible stored-input XSS issue, not as confirmed active exploitation.
Researcher notes
Evidence is narrow but clear: affected product, field, CWE, CVSS, and fixed version are identified. The sources do not describe broader affected components, bypass details, exploit availability, or compensating controls beyond upgrading to 4.0.3.
Mitigation direction
- Upgrade Bubka 2FAuth to version 4.0.3 or later.
- Review the GitHub advisory and 4.0.3 release notes before rollout.
- Limit account creation or import to trusted users until upgraded.
- Review existing account/service values for suspicious script-like content.
- Back up data before remediation or cleanup changes.
Validation and detection
- Inventory all 2FAuth deployments and record running versions.
- Confirm no instance is running a version earlier than 4.0.3.
- Review account creation workflows using a non-production test instance.
- Check account/service field data for unexpected active content markers.
- Document upgrade status and any cleanup performed.
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 lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-36816 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/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:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H1.84.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Bubka/2FAuth/security/advisories/GHSA-cwhq-2mcq-pp9qCVE reference · x_refsource_CONFIRM
- https://github.com/Bubka/2FAuth/releases/tag/v4.0.3CVE 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.