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CVE Record

CVE-2026-2899: Fluent Forms Pro Add On Pack <= 6.1.17 - Missing Authorization to Unauthenticated Arbitrary Attachment Deletion

The Fluent Forms Pro Add On Pack plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 6.1.17. This is due to the `deleteFile()` method in the `Uploader` class lacking nonce verification and capability checks. The AJAX action is registered via `addPublicAjaxAction()` which creates both `wp_ajax_` and `wp_ajax_nopriv_` hooks. This makes it possible for unauthenticated attackers to delete arbitrary WordPress media attachments via the `attachment_id` parameter. Note: The researcher described file deletion via the `path` parameter using `sanitize_file_name()`, but the actual code uses `Protector::decrypt()` for path-based deletion which prevents exploitation. The vulnerability is exploitable via the `attachment_id` parameter instead.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A vulnerable WordPress plugin can let anyone on the internet delete media attachments from affected sites. This is not described as data theft or site takeover, but it can break forms, pages, images, and documents that rely on WordPress media. Sites using Fluent Forms Pro Add On Pack version 6.1.17 or earlier should be reviewed promptly.

Executive priority

Treat as a near-term remediation item for public WordPress sites. Business risk is disruption and content loss, not confirmed takeover. Prioritize higher for sites where forms, uploaded documents, or media assets support revenue, operations, or customer trust.

Technical view

Fluent Forms Pro Add On Pack through 6.1.17 lacks nonce verification and capability checks in Uploader::deleteFile(). The AJAX action is registered publicly, including unauthenticated access. The cited issue is arbitrary WordPress media attachment deletion through attachment_id. The source notes path-based deletion is not exploitable because Protector::decrypt() is used.

Likely exposure

Internet-facing WordPress sites running Fluent Forms Pro Add On Pack 6.1.17 or earlier are potentially exposed. No authentication, user interaction, or special privileges are required. Impact appears limited to integrity and availability of WordPress media attachments based on the provided sources.

Exploitation context

The CVSS score is 6.5 with network access, low complexity, and no privileges required. The source bundle does not identify CISA KEV listing or active exploitation. Public vulnerability details are available from Wordfence and the CVE record.

Researcher notes

The provided description corrects the original researcher focus: path-based deletion is reportedly blocked by Protector::decrypt(), while attachment_id deletion is the exploitable path. Fix details are not fully included in the source bundle, so remediation should be confirmed against vendor guidance and changelog.

Mitigation direction

  • Identify sites running Fluent Forms Pro Add On Pack.
  • Check whether the installed version is 6.1.17 or earlier.
  • Review Fluent Forms vendor changelog and guidance for the corrected release.
  • Update the plugin when a vendor-supported fixed version is available.
  • Back up WordPress files and database before applying plugin changes.
  • Consider temporary compensating controls for unauthenticated AJAX access if immediate updating is impossible.

Validation and detection

  • Confirm plugin name and version on each WordPress site.
  • Verify whether media attachments are missing or unexpectedly deleted.
  • Review WordPress and web server logs for suspicious unauthenticated AJAX activity.
  • Confirm the site is no longer running version 6.1.17 or earlier after remediation.
  • Validate key forms, pages, and media-dependent workflows after updating.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · medium confidence lookup

CWE-862: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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.

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cve · low confidence lookup

CVE-2026-2899 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L3.92.5Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2026-2899Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
techjewelFluent Forms Pro Add On Pack0unaffected
Weakness

CWE details

CWE-862

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-862 · source CWE mapping

Missing Authorization

Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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