Morning Brief — 2026-07-26

3 material breach disclosures, 3 emerging critical cves, 1 supply chain, 23 ransomware activity, 889 ioc volume, 16 active malware families, 25 multi-source iocs, 4 intel feeds, 5 hand-authored sigma, and 17 detection gaps. Sections with no signal are still rendered with an explicit “none in this window” note so absence is visible alongside presence.

Material Breach Disclosures

UPBOUND GROUP, INC. (UPBD)

• Filed: 2026-07-22 · CIK 0000933036 · Accession 0001193125-26-310605
• Filing: https://www.sec.gov/Archives/edgar/data/933036/000119312526310605/upbd-20260721.htm

Caution Concerning Forward-Looking Statements

This Current Report on Form 8-K contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements involve risks and uncertainties, including statements regarding our understanding of the event and its potential impacts. Factors that could cause or contribute to material…

CID Holdco, Inc. (DAIC)

• Filed: 2026-07-22 · CIK 0002033770 · Accession 0001213900-26-080208
• Filing: https://www.sec.gov/Archives/edgar/data/2033770/000121390026080208/ea029882601ex10-1.htm

any written notice from any governmental authority alleging any material violation of applicable cybersecurity or data privacy laws that remains unresolved. To the Company’s knowledge, there are no pending or threatened claims, investigations or proceedings by any governmental authority relating to any material cybersecurity incident or any material violation of applicable cybersecurity or d…

River Financial Corp (RVRF)

• Filed: 2026-07-17 · CIK 0001641601 · Accession 0001193125-26-307288
• Filing: https://www.sec.gov/Archives/edgar/data/1641601/000119312526307288/ck0001641601-20260619.htm

As set forth in its Form 8-K filed July 10, 2026, two class action lawsuits were filed relating to the unauthorized threat actor gaining access to the network environment of River Financial Corporation, including River Bank & Trust (together, “River”). A third class action was filed against River on July 10, 2026 and a fourth class action was filed against River on July 16, 2026.

 

The principal…

Federal Patching Priority

No new KEV additions in this window.

Exploit Probability Movers

No CVEs with ≥0.20 EPSS movement in this window.

Emerging Critical CVEs

• CVE-2026-66012 · CRITICAL (10.0) · 2026-07-25 — SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated only by a general auth check (model.CheckAuth) with no admin-role or read-only enforcement. This expose…
• CVE-2026-15962 · HIGH (8.8) · 2026-07-26 — The Fluent Forms Pro Add On Pack plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.2.6 via deserialization of untrusted input. This makes it possible for authenticated att…
• CVE-2026-63720 · HIGH (7.5) · 2026-07-26 — datamodel-code-generator prior to version 0.70.0 contains a code injection vulnerability that allows attackers who control input schemas to achieve remote code execution by supplying a malicious customBasePath value cont…

Supply Chain

No high/critical GHSA advisories in the 24h window — exploitation-evidence hits below.

Exploitation evidence, 7-day window (severity-agnostic — evidence trumps labels):

• GHSA-f75j-4cw6-rmx4 (CVE-2026-20896, go) · 2026-07-21 — EPSS p98.1

Ransomware Activity

23 new victim postings across 9 groups.

IOC Volume

889 new IOCs in this window. By source:

Recent OSINT Events

No curated MISP events in this window (bulk-IOC contributions tallied in IOC Volume).

Active Malware Families

16 malware families active this week (2 corroborated across ≥2 sources), exercising 20 ATT&CK techniques. Family is the unit, not the indicator: the raw IOCs are drill-down evidence below, not the signal.

Families marked ”→” are delivery/social-engineering clusters (ClearFake, ClickFix, Amadey, GuLoader). Their technique mappings are the delivery chain — downstream behavior is payload-dependent, so they don’t open a hard coverage gap on their own.

Multi-Source IOCs

25 IOCs flagged by 2+ independent sources this window — the highest-confidence signal the cross-feed corpus produces.

MISP × KEV Correlation

No MISP events in this window referenced a CVE.

Cross-Reference

No SEC × KEV vendor token matches in this window. (This is a heuristic surface, absence is expected most days.)

Intel Feeds

4 IOC feeds updated this run (8,736 indicators total) — each available as CSV, MISP JSON, and STIX 2.1. Subscribe at https://thrunt.me/intel/manifest.json.

Hand-Authored Sigma

3 production-ready TTP rules (+2 scaffolds in the authoring queue) live at https://thrunt.me/sigma/manifest.json. Subscribe via https://thrunt.me/sigma/rules.lock.json (content-hash churn) or pull all with https://thrunt.me/sigma/rules.tar.gz.

Detection Gaps

17 of 155 techniques with corpus signal have zero detection coverage — no SigmaHQ community rule, no thrunt rule. This is the hand-authoring queue; the live view is at https://thrunt.me/corpus/attck/.

…and 7 more below the cut — full list on the rollup.

Pipeline Health

All feeds healthy.

Sources: SEC EDGAR (public domain), CISA Known Exploited Vulnerabilities (public domain), FIRST.org EPSS (per ToS), NIST NVD (public domain), GitHub Security Advisories (per ToS), abuse.ch URLhaus (CC0, attribution), ransomware.live (per ToS), MITRE ATT&CK (CC BY 4.0).

Published by Applied Cybernetics Group via thrunt.me. Heuristic cross-references are labelled as such; verify before action.