CVE WatchSep 8, 2026

CVE-2026-73316

XenForo before 2.3.13 contains a payment replay vulnerability in the PayPal REST payment provider that allows attackers to process the same

CVSS

7.5

High

EPSS

—

KEV

—

Exploit Today

—

0-100

Published: Sep 8, 2026 · Last modified: Sep 8, 2026 · CWE-345

EPSS · 30d

Not enough EPSS history yet.

Technical description

XenForo before 2.3.13 contains a payment replay vulnerability in the PayPal REST payment provider that allows attackers to process the same webhook payload multiple times by exploiting a missing duplicate transaction ID check. Attackers can replay a valid webhook payload to trigger duplicate payment events, resulting in repeated subscription activations and unauthorized account upgrades.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-850083.7 LOW

1.8%

——1undici's cache interceptor documents that only safe HTTP methods are cached, but its logic to skip caching is built by subtracting the configured methods from the set of safe methods, so an unsafe method such as POST, PUT, or DELETE is never placed in the skip list and instead falls through to the full cache-read path. The response-storage gate also lacked a method check, so a response to an unsafe request that is heuristically cacheable or carries an explicit Cache-Control directive is stored and later replayed from cache. Because response headers from a remote origin are untrusted, an origin can answer once with a cacheable status and then have the client's own subsequent state-changing requests to that path served from the stale cache entry without ever reaching the origin, an integrity failure that occurs under the interceptor's default configuration. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.3h CVE-2026-856216.5 MED

5.0%

——2LobeChat (LobeHub) 2.2.1 does not properly verify inbound chat-platform webhook signatures in the QQ and Feishu adapters. The webhook route (/api/agent/webhooks/:platform) is unauthenticated by design and delegates verification to each adapter; the QQ adapter performs no Ed25519 signature verification on dispatched message events, and the Feishu adapter only performs an optional static-token comparison that is skipped when no token is configured (the default) and is not a body signature. An unauthenticated attacker who knows the public webhook URL can POST forged inbound messages with an attacker-chosen sender identity and arbitrary text, causing the bot owner's agent to process attacker-controlled input and treat the attacker as a trusted platform sender.5h CVE-2026-840435.3 MED

1.7%

——1The ePayco Payment Gateway for WooCommerce WordPress plugin before 8.4.7 does not properly verify the authenticity of payment confirmation requests, allowing unauthenticated attackers to mark orders as paid without a valid gateway signature.3h CVE-2026-854359.1 CRI

6.8%

——2MOOS-IvP uFldNodeBroker through 24.8.1 fails to validate the source of TRY_SHORE_HOST messages on the vehicle bus, allowing any publisher to enroll attacker-controlled shore routes. Attackers can publish malicious shore route messages to receive bridged vehicle traffic including sensor data and control information.4d CVE-2026-854349.1 CRI

6.8%

——2MOOS-IvP uFldShoreBroker through 24.8.1 fails to verify node ping authenticity before creating outbound bridge routes. Attackers can publish NODE_BROKER_PING messages with crafted HostRecord data to redirect bridged variables to attacker-controlled addresses.4d CVE-2026-854317.5 HIG

78.3%

——23MOOS essential-moos through version 10.0.1 contains an unauthenticated UDP packet injection vulnerability in pMOOSBridge when configured with UDPListen. Attackers can send crafted UDP packets to the configured port to inject arbitrary variables into the local MOOS community with spoofed source and community identifiers.4d