Security readout for executives and security teams
Plain-English summary
SP Page Builder versions 1.0.0 through 6.7.0 contain a shared hardcoded secret that can let unauthenticated attackers misuse website forms to forge sender addresses and relay email. This could enable convincing phishing, damage domain reputation, and disrupt legitimate mail delivery.
Executive priority
Treat as an urgent remediation for public-facing affected sites. Prioritize version inventory and upgrading because abuse could support phishing and harm email reputation without requiring credentials. Escalate any suspicious outbound mail activity for incident review, while avoiding assumptions that exploitation has occurred.
Technical view
CVE-2026-65879 is a CWE-798 hardcoded-secret vulnerability in the Joomla SP Page Builder extension. The product-wide secret permits unauthenticated mail-form abuse and forged From addresses. The supplied record assigns CVSS 3.1 score 9.8, with network access, low complexity, and no privileges or user interaction required.
Likely exposure
Internet-accessible Joomla sites running SP Page Builder 1.0.0 through 6.7.0 are the primary exposure. Risk is especially relevant where the extension's forms can send email. The bundle does not identify specific vulnerable endpoints, configuration prerequisites, or exposure-scanning signatures.
Exploitation context
The vulnerability is remotely reachable and requires neither authentication nor user interaction according to the supplied CVSS vector. However, it is not listed in KEV, and the provided sources do not establish active exploitation, public exploit availability, or observed attack volume.
Researcher notes
The bundle establishes the affected range, hardcoded product-wide secret, unauthenticated mail relay, and sender-address forgery. It does not provide implementation details, indicators of compromise, attack telemetry, or evidence supporting the CVSS confidentiality and availability impacts. Validate those broader impact claims against current vendor guidance.
Mitigation direction
- Upgrade SP Page Builder to version 6.7.1 or later, after confirming current vendor guidance.
- Temporarily restrict or disable affected form email functionality where immediate upgrading is impossible.
- Review outbound mail controls and limit website-originated email to expected senders and destinations.
- Monitor vendor and Joomla security guidance for additional remediation or configuration requirements.
Validation and detection
- Inventory Joomla sites and confirm the installed SP Page Builder version.
- Identify deployments running versions 1.0.0 through 6.7.0.
- Verify affected sites successfully run version 6.7.1 or later after remediation.
- Review outbound mail logs for unexpected sender addresses, volumes, destinations, or delivery failures.
- Confirm form email behavior and legitimate mail delivery after upgrading or applying restrictions.
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-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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-2026-65879 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://www.joomshaper.com/page-builderCVE reference, Joomla · product
- https://mysites.guru/blog/sp-page-builder-sql-injection-mail-relay-disclosure/CVE reference, Joomla · third-party-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.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.