Security readout for executives and security teams
Plain-English summary
Joomla! can generate password and username reset links using plain HTTP even when the site uses HTTPS, unless “Force SSL” is explicitly enabled. This can expose sensitive reset links to interception on affected Joomla! sites.
Executive priority
Treat as urgent for internet-facing Joomla! sites, especially those supporting user accounts. Prioritize patching and SSL configuration validation because account recovery links are highly sensitive.
Technical view
CVE-2026-48902 is a CWE-319 cleartext transmission issue in Joomla! CMS reset-link generation. Affected versions are 3.9.0–5.4.5 and 6.0.0–6.1.0. The CVSS 3.1 score is 9.8, reflecting potential confidentiality, integrity, and availability impact.
Likely exposure
Public Joomla! CMS sites in the affected version ranges are most exposed when using HTTPS without explicitly setting the Force SSL option. Reset workflows are the relevant attack surface.
Exploitation context
The provided sources do not report active exploitation, and this CVE is not listed as KEV. Risk comes from downgrade of sensitive reset links to HTTP, which may expose account recovery links in transit.
Researcher notes
Evidence is limited to CVE metadata and the Joomla! advisory reference. No exploit details, proof of concept, or confirmed exploitation are provided in the supplied sources.
Mitigation direction
- Identify Joomla! sites running affected versions.
- Review the vendor advisory for the official fixed release guidance.
- Upgrade Joomla! to a version not listed as affected.
- Explicitly enable Force SSL where HTTPS is intended.
- Regenerate or expire outstanding reset links after remediation.
Validation and detection
- Confirm Joomla! version is outside affected ranges.
- Verify Force SSL is explicitly enabled where applicable.
- Generate reset links in a safe test account.
- Confirm reset emails contain HTTPS links only.
- Review logs for unusual reset activity.
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-319: 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-48902 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
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/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.
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:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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://developer.joomla.org/security-centre/1050-20260518-core-transport-encryption-downgrade-for-password-and-username-reset-links.htmlCVE reference, Joomla · vendor-advisory
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.
Cleartext Transmission of Sensitive Information
Cleartext Transmission of Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.